Check in her mouth. This is commonly a sign of a tooth that has abscessed into the nasal area and is draining there. If she has red gums, tartar build up, or a tooth that looks broken or bad that might be it.
She may need antibiotics and a dental cleaning.
The reason you would want to do the dental is that the bacteria from the teeth can spread around the body impacting heart, liver and kidneys.
To clean the nose area you can use sterile saline, either a nose spray for children or the type contact lens wearers use, to clean the blocked nose area out.
Hope this helps you!
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